Rachel Schaefer of Denver smokes marijuana on the official opening night of Club 64, a marijuana-specific social club at which a New Year's Eve party was held, in Denver on Monday, Dec. 31, 2012. (AP Photo/Brennan Linsley)

Photo by: Brennan Linsley

Rachel Schaefer of Denver smokes marijuana on the official opening night of Club 64, a marijuana-specific social club at which a New Year's Eve party was held, in Denver on Monday, Dec. 31, 2012. (AP Photo/Brennan Linsley)